They've been evolving constantly since our last test in 2008. We brushed up on eight fresh models, from a supermarket steal to a top-of-the-line buy. Here, three that came out sparkling.

BrushPoint Oscillating Clean Power

At this price, switching from manual is a no-brainer (though users preferred rechargeables). This cheapie ($4, amazon.com) has a strong motor and a design that makes it easy to reach back teeth. Though feature-free, it held a charge the longest.

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